I have two versions of a service that I occasionally want to switch between - my-service-a and my-service-b. I want my-service-a to always be the one which is running when the system is booted. Currently, to switch between them, I have to run multiple commands, e.g. to switch from a to b
systemctl stop my-service-a systemctl start my-service-b
and there is no enforcement by systemd that only one is running at a time - I just have to be careful.
Is there any direct support for this situation in systemd? I could see it being either support for "toggling" between services, or instantiations of a templated service, or I could see it as support for mutually-exclusive services, so that when I start my-service-b, my-service-a is automatically stopped. Or maybe there is another way entirely.